<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			let a = 0, b = 0;
			function A(a){
				A = function(b){
					console.log(a + b++);				
				}
				console.log(a++)
			}
			A(1)
			A(2)
		</script>
	</body>
</html>
